Glossary- flukes
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Flukes are the tail fins of a whale. They are used to help with movement.
http://w3.shorecrest.org/~Lisa_Peck/MarineBio/syllabus/ch9vertebrates/mammals/mammalwp/class_of_2005/ian2/ianadaptations.html
- parasites
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A living thing that feeds on a different animal while contributing nothing to the host.
